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#!/usr/bin/python
# orig_dict_cache.py; older listdir caching implementation
# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
#$Header: /local/data/ulm/cvs/history/var/cvsroot/gentoo-src/portage/pym/orig_dict_cache.py,v 1.7 2004/11/09 23:20:47 ferringb Exp $
"""per process caching of os.listdir returns.
Symlink unaware, so beware of webs of symlinks"""
import portage_util, os, stat
import portage_file
dircache = {}
cacheHit = 0
cacheMiss = 0
cacheStale = 0
def cacheddir(my_original_path):
"""return results from cache, updating cache if its stale/incomplete"""
global cacheHit, cacheMiss, cacheStale, dircache
mypath=portage_file.normpath(my_original_path)
if dircache.has_key(mypath):
cacheHit += 1
cached_mtime, list, ftype = dircache[mypath]
else:
cacheMiss += 1
cached_mtime, list, ftype = -1, [], []
pathstat = os.stat(mypath)
if stat.S_ISDIR(pathstat[stat.ST_MODE]):
mtime = pathstat[stat.ST_MTIME]
else:
raise Exception
if mtime != cached_mtime:
if dircache.has_key(mypath):
cacheStale += 1
list = os.listdir(mypath)
ftype = []
for x in list:
try:
pathstat = os.lstat(mypath+"/"+x)
if stat.S_ISREG(pathstat[stat.ST_MODE]):
ftype.append(0)
elif stat.S_ISDIR(pathstat[stat.ST_MODE]):
ftype.append(1)
elif stat.S_ISLNK(pathstat[stat.ST_MODE]):
pathstat = os.stat(mypath+"/"+x)
if stat.S_ISREG(pathstat[stat.ST_MODE]):
ftype.append(2)
elif stat.S_ISDIR(pathstat[stat.ST_MODE]):
ftype.append(3)
else:
ftype.append(4)
except SystemExit, e:
raise
except:
ftype.append(3)
dircache[mypath] = mtime, list, ftype
return list[:],ftype[:]
portage_util.writemsg("cacheddirStats: H:%d/M:%d/S:%d\n" % (cacheHit, cacheMiss, cacheStale),10)
return ret_list, ret_ftype
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